Media Galleries: Refactor DeviceMediaAsyncFileUtil.

chrome/browser/media_galleries/fileapi/native_media_file_util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_NATIVE_MEDIA_FILE_UTIL_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_NATIVE_MEDIA_FILE_UTIL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "webkit/browser/fileapi/async_file_util.h"
@@ skipping 207 matching lines @@
   // If the media_path_filter() check fails, return |failure_error|.
   // If |local_file_path| is a directory, return File::FILE_OK.
   base::File::Error GetFilteredLocalFilePathForExistingFileOrDirectory(
       fileapi::FileSystemOperationContext* context,
       const fileapi::FileSystemURL& file_system_url,
       base::File::Error failure_error,
       base::FilePath* local_file_path);
 
 
   // Not owned, owned by the backend which owns this.
-  MediaPathFilter* media_path_filter_;
+  MediaPathFilter* const media_path_filter_;
 
   base::WeakPtrFactory<NativeMediaFileUtil> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeMediaFileUtil);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_NATIVE_MEDIA_FILE_UTIL_H_